Yaskawa AC Servo Drive Rotary Servomotor Safety Precautions - Manual (Page 14)

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• When overtravel occurs, the power supply to the motor is turned OFF
and the brake is released. If you use the Servomotor to drive a vertical
load, set the Servomotor to enter a zero-clamped state after the Servo-
motor stops. Also, install safety devices (such as an external brake or
counterweight) to prevent the moving parts of the machine from falling.
• Always turn OFF the servo before you turn OFF the power supply. If
you turn OFF the main circuit power supply or control power supply
during operation before you turn OFF the servo, the Servomotor will
stop as follows:
• If you turn OFF the main circuit power supply during operation without
turning OFF the servo, the Servomotor will stop abruptly with the
dynamic brake.
• If you turn OFF the control power supply without turning OFF the servo,
the stopping method that is used by the Servomotor depends on the
model of the SERVOPACK. For details, refer to the manual for the SER-
VOPACK.
NOTICE
• Always measure the vibration of the Servomotor with the Servomotor
mounted to the machine and confirm that the vibration is within the
allowable value.
If the vibration is too large, the Servomotor will be damage quickly and
bolts may become loose.
• When you adjust the gain during system commissioning, use a mea-
suring instrument to monitor the torque waveform and speed wave-
form and confirm that there is no vibration.
If a high gain causes vibration, the Servomotor will be damaged quickly.
• An alarm or warning may occur if communications are performed with
the host controller while the SigmaWin+ or Digital Operator is operat-
ing.
If an alarm or warning occurs, it may interrupt the current process and
stop the system.
Continued from previous page.
CAUTION